1、弹框出现在屏幕中间位置
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"是否退出" preferredStyle: UIAlertControllerStyleAlert]; [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]]; [alert addAction:[UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) { //点击确认后需要做的事 }]]; [self presentViewController:alert animated:YES completion:nil]; //注意一定要写此句,否则不会显示
此方法可以添加文本框,输入内容
[alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) { textField.placeholder = @"请输入名字"; }]; [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) { textField.placeholder = @"请输入价格"; }];
2、弹框出现在屏幕底部(两种方式的不同点在于代码第一行最后的,底部是UIAlertControllerStyleActionSheet)
1 UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"是否退出" preferredStyle: UIAlertControllerStyleActionSheet]; 2 [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]]; 3 [alert addAction:[UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) { 4 //点击确认后需要做的事 5 }]]; 6 [self presentViewController:alert animated:YES completion:nil]; //注意一定要写此句
7 [self showViewController:alert sender:nil]; //此句也可以
注:如果是其它类,不是控制器,则可以用下面方法让弹框显现出来:
1 UIViewController *vc = [UIApplication sharedApplication].keyWindow.rootViewController; 2 [vc showViewController:alert sender:nil];